[Laccase of the lignolytic fungus Trametes hirsuta: purification and characterization of the enzyme, and cloning and primary structure of the gene].

The main physicochemical characteristics of the major isoform of the laccase secreted by the fungu, Trametes hirsuta 072 were studied. The enzyme belongs to the group of high redox potential laccases (E(T1) = 790 +/- 5), and it oxidizes with high efficiency various substrates of phenolic nature. The gene of this isoform was cloned, and its nucleotide sequence was determined.

[Evidence of the existence of hemolysin II from Bacillus cereus: cloning the genetic determinant of hemolysin II].

The hemolysin genetic determinant distinct from cereolysin AB genetic determinant (lecithinase and sphingomyelinase genes) has been cloned in Escherichia coli and Bacillus subtilis cells as an EcoRI fragment (2.9 kb) of Bacillus cereus VKM-B771 chromosome DNA. The hemolytic product encoded by the cloned DNA fragment possessed all the properties of hemolysin II known to date: it was not inhibited by cholesterol, exhibited the Arrhenius effect, and had a relatively long (in comparison with cereolysin) lag period in erythrocyte lysis.